Refactor MainHook into TestSuite.

media/base/run_all_unittests.cc

Index: media/base/run_all_unittests.cc
diff --git a/media/base/run_all_unittests.cc b/media/base/run_all_unittests.cc
index b66b04bd0c165147cda8792185effabe020d3389..ea4b7dddd55dfa2ed87132e9051bbb61fc375bb3 100644
--- a/media/base/run_all_unittests.cc
+++ b/media/base/run_all_unittests.cc
@@ -2,7 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "base/test/main_hook.h"
 #include "base/test/test_suite.h"
 #include "media/base/media.h"
 
@@ -23,6 +22,5 @@ void TestSuiteNoAtExit::Initialize() {
 }
 
 int main(int argc, char** argv) {
-  MainHook hook(main, argc, argv);
   return TestSuiteNoAtExit(argc, argv).Run();
 }